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A wannabe popstar who doesn't have much talent.
Diana: "Have you heard about (insert music artist here)?"

Yvonne: "Oh joy, another poopstar to stink up the music industry!"
by Thora Rogers April 23, 2006
When you butthole is so tight you poop out lil star shaped turds
man after She went up there with the icicle I made poopstars for a week !
by Shiskaboom April 09, 2010
An anus, as it resembles a star and is used to defacate.
I was checkin' out this stripper, and she winked at me with her poopstar
by slickster September 18, 2003